Rio Grande Valley PF225 ESSR - CBP.gov

2-4
Table 2-3, continued
Notes:
Wetland type
Segment
Size
(acres)
Impact
(acres)
PFO/PSS O-13 0.2 0
PSS/PEM O-13 0.1 0
PEM O-13 0.1 0
PEM O-13 0.4 0.1
PFO O-18 0.0 0
PEM/PSS O-18 0.2 0
POW/PEM O-18 0.7 0
PFO/PEM O-21 0.3 0
POW/PEM O-21 1.8 0
PFO O-20 0.4 0
Total 12.7 1.31
PEM=Palustrine Emergent; PSS=Palustrine Scrub-Shrub; POW=Palustrine Open Water;
PFO= Palustrine Forested
2.2 SEGMENTS O-4 THROUGH O-10
The ESP anticipated that O-4 through O-10 would consist of seven distinct segments of a
concrete flood protection structure/concrete fence in Hidalgo County and would affect an
approximately 40-foot-wide corridor. This structure would be built where the current USIBWC
levee exists; the access roads and all construction activities were to be contained within the
USIBWC ROW.
The structure would range from 15 to 18 feet in height based on USIBWC requirements not to
affect floodwaters in Mexico in accordance with international treaty obligations. Also, a guard
rail or bollard fence would be built on top of the structure to ensure the safety of drivers using
the road on top of the levee. Controlled access gates in the concrete fence would allow access to
the area on the Rio Grande side of the TI by irrigation personnel, emergency services,
recreational users, and others. An access road was also planned adjacent to the bottom of the
structure on the river side.
As stated in the ESP, building the concrete flood protection structure/concrete fence would affect
a corridor approximately 24 to 40 feet wide on the river (flood) side of the levee. The ESP
proposed removing approximately 24 feet of levee on the flood side and anticipated that
construction would have a temporary impact on approximately 16 additional feet within the
USIBWC ROW. The ESP estimated that the total permanent impact area would be
approximately 106.2 acres. The ESP did not discuss temporary impact acreage associated with
proposed staging areas, but those areas were included in CBP data files. As Table 2-4 shows, the
planned staging areas for O-4 through O-10, according to the FITT data files, were expected to
total 52.8 acres.
RGV_PF225_ESSR
Final